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The OCR example

In this example, we will demonstrate how to detect characters from an image i.e. Optical Character Recognition (OCR).

Prerequisites

If you have not done so already, follow these simple instructions to install Rust and ssvmup.

Build the WASM bytecode

Notice that we are using the --enable-ext flag which will use ssvm-extensions instead of ssvm.

$ ssvmup build

Create FaaS function

Upload the wasm file in the pkg folder to the FaaS. Double check the .wasm file name before you upload.

curl --location --request POST 'https://rpc.ssvm.secondstate.io:8081/api/executables' \
--header 'Content-Type: application/octet-stream' \
--header 'SSVM-Description: Translate' \
--data-binary '@pkg/translate_lib_bg.wasm'

Returns

{"wasm_id":283,"wasm_sha256":"0x39cfdbe0d0aa31d87e81d72506fa88af5ab6f3ba82b3d09f5330aac8ba061673","SSVM_Usage_Key":"00000000-0000-0000-0000-000000000000","SSVM_Admin_Key":"xxxxxx-de44-4fc8-abf7-03f61f648b71"}

Note: You can update this binary with the SSVM_Admin_Key.

curl --location --request PUT 'https://rpc.ssvm.secondstate.io:8081/api/update_wasm_binary/283' \
--header 'Content-Type: application/octet-stream' \
--header 'SSVM_Admin_Key: xxxxxx-de44-4fc8-abf7-03f61f648b71' \
--data-binary '@pkg/translate_lib_bg.wasm'

Test

Make a function call via the web.

curl --location --request POST 'https://rpc.ssvm.secondstate.io:8081/api/multipart/run/283/translate' \
--form 'input_1="Saluton, Mondo"' \
--form 'input_2="en"'

Returns

Hello World

Output language options

If you are building a web app, please specify the language which you want the input translated to via your form like this

<div class="form-group">
  <label for="input_3">Would you like to translate the input to another language?</label>
  <fieldset>
     <legend>Output translation options</legend>
     <p>
        <label>Output translation options</label>
        <select id = "input_3">
           <option value = "af">Afrikaans</option>
           <option value = "ar">Arabic</option>
           <option value = "be">Belarusian</option>
           <option value = "bn">Bengali</option>
           <option value = "bs">Bosnian</option>
           <option value = "bg">Bulgarian</option>
           <option value = "cs">Czech</option>
           <option value = "zh-CN">Chinese simplified</option>
           <option value = "zh-TW">Chinese traditional</option>
           <option value = "en" selected>English</option>
           <option value = "fr">French</option>
           <option value = "ja">Japanese</option>
           <option value = "ko">Korean</option>
           <option value = "ru">Russian</option>
           <option value = "uk">Ukrainian</option>
        </select>
     </p>
  </fieldset>
</div>

Live demo

Please click on this HTML link which will take you to the live demonstration.